agra
ea32f8a27a
ffi M2.3: #extends method-resolution chaining + Obj-C parent resolution
...
When 'obj.method()' is called on a foreign-class pointer and the
method isn't declared on the receiver's class, the compiler walks
the '#extends' chain to find an ancestor that declared it.
Property lookup (M2.2) flows through the same chain walker.
ParentX :: #foreign #objc_class("...") { foo :: ... }
ChildX :: #foreign #objc_class("...") { #extends ParentX; }
child.foo() // now resolves — was 'no method foo on ChildX'
Two new helpers in lower.zig:
- findForeignMethodInChain(fcd, name) walks the cache via
fcd.members[i].extends → foreign_class_map[parent] → ...
Depth-capped at 16 to break accidental cycles.
- findForeignPropertyInChain(fcd, name) — same shape for fields.
ALSO fixes a latent class-hierarchy bug uncovered while testing
M2.3: emit_llvm was passing the sx alias name to
objc_allocateClassPair(super, ...) rather than the actual Obj-C
runtime class name. For 'SxThing :: #objc_class(...) { #extends
NSObjectBase; }' where 'NSObjectBase' is aliased to "NSObject",
emit_llvm produced 'objc_getClass("NSObjectBase")' → NULL →
'objc_allocateClassPair(NULL, ...)' → SxThing's super-class link
was broken → '[sx_thing hash]' bypassed NSObject and crashed in
the forwarding machinery.
Fix: ObjcDefinedClassEntry gains a 'parent_objc_name' field
pre-resolved by lower.zig's 'resolveObjcParentName' through
foreign_class_map (which has the alias → foreign_path mapping).
emit_llvm just reads the resolved name from the entry.
153-objc-extends-chain.sx exercises both fixes:
1-level: SxThing → NSObject — t.hash() walks one #extends.
2-level: SxLeaf → SxMiddle → NSObject — chained #extends.
Both return real NSObject.hash values from libobjc.
183 example tests pass (+1). zig build test green.
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..
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